Aesthetic enthusiasm. Perception of beauty in the external world, or, on the other hand, in words and their right arrangement. Pleasure in the impact of one sound on another, in the firmness of good prose or the rhythm of a good story. Desire to share an experience which one feels is valuable and ought not to be missed. The aesthetic motive is very feeble in a lot of writers, but even a pamphleteer or writer of textbooks will have pet words and phrases which appeal to him for non-utilitarian reasons; or he may feel strongly about typography, width of margins, etc. Above the level of a railway guide, no book is quite free from aesthetic considerations.